Film magazine for motion picture camera

Details Film magazine for motion picture camera Film magazine for motion picture camera

1981-10-19

1983-12-06

Hayes, Monroe H.

Optics: motion pictures

Removable film strip magazine type

Magazines

352172, 352182, 242199, G03B 2302

Patent

active

044189940

ABSTRACT:
A film magazine for a motion picture camera contains apparatus for maintaining the tension in the film strip from the supply reel and in the film strip to the takeup reel, within predetermined limits, to permit start-and-stop operations of the camera while minimizing danger of damage to the film. The supply reel is connected to an eddy current brake, and a takeup reel is powered by a motor responsive to a tension control device. The eddy current brake on the supply reel provides braking torque of relatively high magnitude when the supply reel is large in diameter, and the braking torque reduces gradually to a minimum as the diameter reduces.
Tension in the film strip leading to the takeup reel is controlled by a tension measuring device which acts to vary the power delivered to the motor driving the takeup reel, to obtain uniform winding tightness.
Loading of a full reel of film into the magazine is accomplished while a reel-contacting measuring device is latched in retracted position; closing of the magazine cover releases the latch.

REFERENCES:
patent: 1880106 (1932-09-01), Robinson
patent: 1992706 (1935-02-01), Lira
patent: 2107039 (1938-02-01), Leventhal et al.
patent: 3601641 (1971-08-01), Baermann
patent: 4312576 (1982-01-01), Dejeney

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